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In this branch passing a :source-map compiler option will trigger the generation of the V3 source maps for the Closure compiled JavaScript. However this only maps the JavaScript generated by the ClojureScript compiler to the JavaScript produced by Closure. In order to be useful we need to read this source map and merge it its contents with whatever information was produced by the ClojureScript compilinganalyzer. This would allow mapping all the way from a line in advanced compiled JavaScript to a line in the original Clojure source.